Creating an imageField from a charField

Does anyone know how to instantiate an imageField using just the URL
of the image?

I am storing my URLs to images in a charField, but I am letting the
user interact with the imageField. Everything works fine to render the
imageField and I can use the imageField to upload an image. The url of
the stored image is safely stored in the database in a charField. The
only problem is I can't figure out how to pass the image url to the
imageField when I dynamicly create the imageField.

Is there a way to bind the data from the charField to the imageField.
I looked through all the data binding documentation and it doesnt show
how to bind data on a per field basis.

Any suggestions would help. The reason I have the url in a charField
is because its a property in a sudo triplestore.

Here is a sample of the code for my form.

class MetadataForm(ModelForm):
"""
Based upon the metatype create the correct field for this form.
"""
def __init__(self, *args, **kwargs):
super(MetadataForm, self).__init__(*args,**kwargs)

type_id = self.instance.metaType_id

if type_id != None:
self.fields['value'] = self.createField(type_id)

def createField(self,type):

metatype = MetaType.objects.get(id=type)

if (metatype.type == 'charField'):
return forms.CharField(widget = forms.Textarea,
required=False)
if (metatype.type == 'imageField'):
f = forms.ImageField(required=False)
return f

Thanks for the help,

Brian

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